T56 replacement ‘box

The TREMEC T56 was introduced in the early VR, VS and VT1 behind the Holden V8 and then with the Commodore VT Series II in late 1999, with the 5.7-litre LS1 Chev V8 engine. It was discontinued at the end of 2006 in the VZ, making way for a T56 in a different format for the VE from 2006 to 2008 and then progressing to the TR-6060 sixspeed with the release of the VE Series II.

Now owners of LS1-powered VT-VZ Commodores can upgrade from their old T56s to the new TREMEC Magnum-F – effectively a later model TR-6060 redesigned to t the LS1 engine.

Apart from the Magnum-F being a better transmission (and with a far superior shift action), it’s a solution for the growing problem of replacement parts availability for a transmission that’s been out of production for almost 15 years.

And for owners of supercharged or modi ed LS1s, the Magnum series offers the durability that was lacking in the T-56 – the Magnum has the capability to handle twice the power the earlier transmission could.

The new Magnum transmission is a straight t in all VT-through VZ models – although it requires a new tailshaft (which Mal Wood Automotive manufacturers especially) to accept the Magnum’s 31-spline output shaft, as well as a Mal Wood Automotive Ultimate Street Short Throw shifter (an upgrade which AMC can thoroughly endorse, having tried one to the editorial VY SS…).